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Method for Sterilising a Medical Device Having a Hydrophilic Coating

a technology of hydrophilic coating and medical devices, which is applied in the direction of coatings, disinfection, construction, etc., can solve the problems of osmotic potential, risk of abrasion of the coating during insertion, water will be extracted from the hydrophilic surface coating and into the tissues of the surrounding mucous membranes, etc., and achieves low friction and high water retention

Inactive Publication Date: 2008-11-27
COLOPLAST AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027]One advantage of the present method is that it allows the aqueous medium and the hydrophilic polymer(s) to be stored separately and just mixed when needed. This prolongs the shelf-life of each of the products and simplifies the logistics in a production plant.

Problems solved by technology

When the product remains inside the body only for a short period, there may be a risk that water will be extracted from the hydrophilic surface coating and into the tissues of the surrounding mucous membranes etc., owing to a higher osmotic potential of said tissues.
At the same time, there is a risk of abrasion of the coating during insertion.
As a result of the extraction of water or loss of coating, the hydrophilic surface coating will have a tendency to become less slippery and to stick to surrounding tissues, and the removal of the medical device from the body may cause pain or damage the tissue.
This is especially a problem when carrying out urodynamic examinations via a catheter.
It has been found, however, that most hydrophilic coatings lose their water retention and that the coefficient of friction increases when the coatings are stored in water for an extended period of time and / or particularly after sterilisation using irradiation or autoclaving.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Preparation of a Catheter having a Crosslinked Two-Layer Hydrophilic Coating

[0117]5 parts of PVP K 90 and 0,05 parts of ESACURE KIP 150 were dissolved in 94,95 parts of an ethanol / gamma butyrolactone solvent mixture. PVC-catheters were dipped in the solution and dried 1 minute at ambient temperature and then dipped in a PVP-solution containing 5 parts of PVP, 1 part of urea and 94 parts of an ethanol / gamma butyrolactone (85 / 15) solvent mixture. The catheters were further dried for 30 minutes at 700 C and exposed to UV-light having a wave length range between 200 and 300 nm. for 5 minutes.

example 2

Preparation of a Catheter having a Crosslinked Hydrophilic Coating with Unsaturated Poly(Methyl Vinyl Ether / Maleic Anhydride) / Hydroxyethylmethacrylate(HEMA) Prepolymers

[0118]20 parts of Gantrez® AN 119 was dissolved in 200 parts of acetone in a reaction vessel equipped with at stirrer. The reaction mixture was kept at room temperature. One drop of 1-methylimidazole was added to the solution as a catalyst. 5 mole % 2-hydroxyethylmethacrylate, based on contents of maleic anhydride were added dropwise to the stirred polymer solution during a period at 30 min. The mixture was stirred for further 2 hours at room temperature.

[0119]A 50:50 primer mixture with 5% solids was prepared by dissolving a medical grade polyurethane and the Poly(methyl vinyl ether / maleic anhydride) / HEMA unsaturated prepolymer in a 50:50 mixture of THF and acetone and was coated on PVC catheters as a primer by dipping in a manner known per se.

[0120]The catheters were dipped in the solution of poly(methyl vinyl ether...

example 3

[0122]A top coat and a primer solution were prepared as in Example b. To the solutions was added 1% by weight of the solid Darocure® 1173, a UV photo-initiator obtainable from Ciba Geigy.

[0123]PVC catheters were dipped in the primer solution, dried for 30 minutes and dipped in the top coat solution also containing 1% by weight of the solid of Darocure® 1173 and dried for further 30 minutes. Then, the coating was cross-linked by exposure to UV light.

[0124]The cross-linked coatings were then hydrolysed and neutralised in a sodium hydrogen carbonate buffer solution for one hour before drying.

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PUM

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Abstract

The present invention relates to sterilisation of medical devices having hydrophilic coatings and more specific to sterilisation of medical devices having a wetted hydrophilic coating using radiation. The medical devices sterilised according to the invention show, after sterilisation using radiation, a prolonged water drain off time and reduced friction force.

Description

Field of the Invention[0001]The present invention relates to sterilisation of medical devices having hydrophilic coatings and more specific to sterilisation of medical devices having a wetted hydrophilic coating using radiation. The medical devices sterilised according to the invention show, after sterilisation using radiation, a prolonged water drain off time and reduced friction force.Description of the Related Art[0002]It is known to coat medical devices, e.g. catheters for introduction into human cavities such as blood vessels, digestive organs and the urinary system, with a hydrophilic coating, normally as a minimum applied on that part of the surface which is introduced or comes into contact with mucous membranes, etc., during introduction of the device. Whereas such coating is not particularly smooth when dry, it becomes extremely slippery when it is swelled with water, preferably immediately before introduction into the human body and thus ensures a substantially painless in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61L2/08
CPCA61L2/081A61L2/087A61L29/085A61L31/10A61L2202/23A61L2202/24
Inventor MADSEN, NIELS JORGEN
Owner COLOPLAST AS
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